D61 may refer to: , a 1915 Royal Australian Navy River class torpedo boat destroyer , a 1917 British Royal Navy C class cruiser , a 1937 British Royal Navy I-class destroyer , a 1995 Indian Navy Delhi class destroyer JNR Class D61, a Japanese steam locomotive converted from the JNR Class D51 D61 motorway (Slovakia) SPS Churruca (D61), a 1972 Spanish Navy Gearing-class destroyer Queen's Gambit Declined, Encyclopaedia of Chess Openings code and also : the ICD-10 code for other aplastic anaemias